Myrmecophila tibicinis Is The New Name - I Know It As Schomburgkia tibicinis
This orchid comes from Mexico and all the way to Colombia. The large psuedobulbs are hollow with an entrance at the base and ants live in them. When the flower spike was growing the ants were all over the stem gathering nectar. The 5 foot stem and the flowers have nectar. Notice the ant on the flower. I let them alone because they bite.